Mark A Engle (Former Employee)
Science and Products
Filter Total Items: 64
Characterization and cycling of atmospheric mercury along the central US Gulf Coast
Concentrations of atmospheric Hg species, elemental Hg (Hg∘), reactive gaseous Hg (RGM), and fine particulate Hg (Hg-PM2.5) were measured at a coastal site near Weeks Bay, Alabama from April to August, 2005 and January to May, 2006. Mean concentrations of the species were 1.6 ± 0.3 ng m−3, 4.0 ± 7.5 pg m−3 and 2.7 ± 3.4 pg m−3, respectively. A strong diel pattern was observed for RGM (midday maxim
Authors
M.A. Engle, M.T. Tate, D. P. Krabbenhoft, A. Kolker, M.L. Olson, E.S. Edgerton, J.F. DeWild, A.K. McPherson
Atmospheric mercury emissions from substrates and fumaroles associated with three hydrothermal systems in the western United States
This paper quantifies atmospheric mercury (Hg) emissions from substrates and fumaroles associated with three hydrothermal systems: Lassen Volcanic Center, California (LVC); Yellowstone Caldera, Wyoming (YC); and Dixie Valley, Nevada (DV). Substrate Hg fluxes were measured using field chamber methods at thermal and nonthermal sites. The highest Hg fluxes (up to 541 ng m−2 h−1) were measured at ther
Authors
Mark A. Engle, Mae S. Gustin, Fraser Goff, Dale Counce, Cathy J. Janik, Deborah Bergfeld, James J. Rytuba
The influence of ozone on atmospheric emissions of gaseous elemental mercury and reactive gaseous mercury from substrates
Experiments were performed to investigate the effect of ozone (O 3) on mercury (Hg) emission from a variety of Hg-bearing substrates. Substrates with Hg(II) as the dominant Hg phase exhibited a 1.7 to 51-fold increase in elemental Hg (Hgo) flux and a 1.3 to 8.6-fold increase in reactive gaseous mercury (RGM) flux in the presence of O3-enriched clean (50 ppb O3; 8 substrates) and ambient air (up to
Authors
M.A. Engle, Gustin M. Sexauer, S.E. Lindberg, A.W. Gertler, P.A. Ariya
Atmospheric mercury emissions from mine wastes and surrounding geologically enriched terrains
Waste rock and ore associated with Hg, precious and base metal mining, and their surrounding host rocks are typically enriched in mercury relative to natural background concentrations (
Authors
M.S. Gustin, M.F. Coolbaugh, M.A. Engle, B.C. Fitzgerald, R.E. Keislar, S.E. Lindberg, D.M. Nacht, J. Quashnick, J. J. Rytuba, C. Sladek, H. Zhang, R. E. Zehner
Science and Products
Filter Total Items: 64
Characterization and cycling of atmospheric mercury along the central US Gulf Coast
Concentrations of atmospheric Hg species, elemental Hg (Hg∘), reactive gaseous Hg (RGM), and fine particulate Hg (Hg-PM2.5) were measured at a coastal site near Weeks Bay, Alabama from April to August, 2005 and January to May, 2006. Mean concentrations of the species were 1.6 ± 0.3 ng m−3, 4.0 ± 7.5 pg m−3 and 2.7 ± 3.4 pg m−3, respectively. A strong diel pattern was observed for RGM (midday maxim
Authors
M.A. Engle, M.T. Tate, D. P. Krabbenhoft, A. Kolker, M.L. Olson, E.S. Edgerton, J.F. DeWild, A.K. McPherson
Atmospheric mercury emissions from substrates and fumaroles associated with three hydrothermal systems in the western United States
This paper quantifies atmospheric mercury (Hg) emissions from substrates and fumaroles associated with three hydrothermal systems: Lassen Volcanic Center, California (LVC); Yellowstone Caldera, Wyoming (YC); and Dixie Valley, Nevada (DV). Substrate Hg fluxes were measured using field chamber methods at thermal and nonthermal sites. The highest Hg fluxes (up to 541 ng m−2 h−1) were measured at ther
Authors
Mark A. Engle, Mae S. Gustin, Fraser Goff, Dale Counce, Cathy J. Janik, Deborah Bergfeld, James J. Rytuba
The influence of ozone on atmospheric emissions of gaseous elemental mercury and reactive gaseous mercury from substrates
Experiments were performed to investigate the effect of ozone (O 3) on mercury (Hg) emission from a variety of Hg-bearing substrates. Substrates with Hg(II) as the dominant Hg phase exhibited a 1.7 to 51-fold increase in elemental Hg (Hgo) flux and a 1.3 to 8.6-fold increase in reactive gaseous mercury (RGM) flux in the presence of O3-enriched clean (50 ppb O3; 8 substrates) and ambient air (up to
Authors
M.A. Engle, Gustin M. Sexauer, S.E. Lindberg, A.W. Gertler, P.A. Ariya
Atmospheric mercury emissions from mine wastes and surrounding geologically enriched terrains
Waste rock and ore associated with Hg, precious and base metal mining, and their surrounding host rocks are typically enriched in mercury relative to natural background concentrations (
Authors
M.S. Gustin, M.F. Coolbaugh, M.A. Engle, B.C. Fitzgerald, R.E. Keislar, S.E. Lindberg, D.M. Nacht, J. Quashnick, J. J. Rytuba, C. Sladek, H. Zhang, R. E. Zehner